1. Lesson: Pressure

2. Science Differentiation in action Which side would you prefer to press with your finger? Flat side? Pointed side? Why?

3. Science Differentiation in action Which puts more pressure on the ground? Why? OR

4. Science Differentiation in action PRESSURE is a measure of the amount of force being put on a certain area. Pressure is measured in Pacals (Pa). Pressure = ------------- Force Area

5. Science Differentiation in action REMEMBER Mass is the amount of matter in an object. It is measured in Kilograms (Kg). It is not a force. Weight is the force of gravity acting on the mass of an object. Weight is measured in Newtons. WEIGHT = 1200 N MASS = 120 Kg

6. Science Differentiation in action If a block weighs 1200 N and the area under the block is 12m 2, calculate the pressure it puts on the ground. Pressure = ------------- FORCE AREA Pressure = ------------- 1200 N 12 m 2 Pressure = 100 Pa

7. Science Differentiation in action Some important examples of pressure! Where else is pressure important?

8. Science Differentiation in action Teton Dam (USA) Failure in 1976 Why is it important to understand pressure?

9. Science Differentiation in action Carry out an investigation to show the relationship between pressure and depth in a liquid. 1.Set up the apparatus as shown. 2.Remove the pins. 3.Remove the cap. 4.Measure how far the water spurts out from each hole. 5.Record results in a table. cap pins Plastic bottle Ruler METHOD

10. Science Differentiation in action Review Questions 2. What unit is Pressure measured in? 1. Pressure= ------------- Force ? 3. How does pressure vary with depth in a liquid?

11. Science Differentiation in action Why is pressure important in a space station? Question to think about!